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(CNN) — The aviation industry might be known for its volatility and financial instability, particularly in recent years, but a surprising number of airlines from the pioneering early days of commercial flight are still surviving in their original form.
Finnish flag carrier Finnair celebrates its 100th anniversary on November 1, having been founded in 1923 as a seaplane service, while the Czech Republic's flag carrier Czech Airlines made its first flight just a few days earlier in October 2023.
Here are 10 of the oldest airlines in the world still in operation.
1. KLM
Year of foundation: 1919
First flight: May 1920
Passengers transported in the first year: 440
Passengers transported in 2022: 25.8 million
As a nation that once had the largest merchant fleet in the world, it seems fitting that the Dutch were among the first to set up a national airline that became a strong force to be reckoned with.
The need to connect Amsterdam to what was then known as the Dutch East Indies would certainly have been a powerful motivation to get KLM off the ground in the early days.
Although formally founded in October 1919, the new airline did not really take off until May 1920, when a four-seater De Havilland DH.16 made the inaugural flight to London's now defunct Croydon Airport.
In 1924, KLM launched a service from Amsterdam to Batavia (as Jakarta was then known), the world's longest air route at the time.
In 1946, it became the first European airline to begin scheduled flights to New York, using DC-4 aircraft.
Throughout its century and more of existence, KLM's commitment to innovation has been constant.
This doesn't just apply to its fleet either. The airline has also proved pioneering with its use of social media, introducing the first social media-driven flight schedule.
2. Avianca
Avianca is the biggest airline in Colombia.
JUAN MABROMATA/AFP/Getty Images
Year of foundation: 1919
First flight: 1919
Passengers transported in 2022: 24.6 million
Founded by German immigrants in Barranquilla, Colombia, in 1919, Avianca was originally named SCADTA and operated Junkers F13 aircraft, some of which were equipped with floats.
As the world moved closer to war In the late 1930s, SCADTA became a source of concern for the US government, who were worried about the security implications of the airline's links to Germany.
Pan American World Airways subsequently acquired a controlling stake in the company.
In 1949, SCADTA merged with fellow Colombian airline SACO (Servicio Aéreo Colombiano) and adopted its current name.
Today, after absorbing several airlines in neighboring countries, Avianca is one of the largest airline groups in Latin America, with a fleet of more than 130 aircraft and a network of subsidiaries that spans pretty much the whole continent.
3. Qantas
The Qantas logo is known as "The Flying Kangaroo."
Qantas
Year of foundation: 1920
Passengers transported in 2022: 21.3 million
Few people outside of Australia know that Qantas stands for "Queensland and Northern Territory Aerial Services."
As its name indicates, the initial goal of the airline was to service the tropical and sparsely populated lands of Northern Australia.
Its first aircraft was an Avro 504, a pre-World War I biplane that could seat a pilot and one passenger.
Qantas was nationalized by the Australian government after World War II and reprivatized in the '90s.
Its kangaroo livery first appeared in 1944 and accompanied the airline during the airline's expansion throughout the Asia-Pacific region and beyond.
Today Qantas remains the de facto flag carrier of Australia as well as the country's largest airline and one of its best known brands globally.
4. Aeroflot
Aeroflot was the largest airline in the world during the Soviet era.
Stanislav Sergeev/Alamy
Year of foundation: 1923
First flight: July 1923
Passengers transported in 2022: 20.5 million
A flight from Moscow to Nizhny Novgorod carrying six people (four passengers and two crewmen) on a Junkers F13 marked the start of what would turn out to be the Soviet Union's, and later, the Russian Federation's flag carrier.
Originally called Dobrolet, it was renamed Aeroflot in 1932, when the Soviet government decided to place the whole civilian aviation fleet under one single entity.
After World War II, Aeroflot became the largest airline in the world, as air travel was often the only means of transportation available to bridge the vast expanses of the Soviet Union.
In 1956, the airline introduced the Tupolev Tu-104, considered the first truly successful jet airliner.
During the Cold War years, Aeroflot operated the long range Il-62, which flew all the way to Cuba by way of Murmansk, in the Arctic, and the supersonic Tupolev Tu-144, the Soviet Union's answer to the Concorde.
In much the same fashion as the Soviet Union, Aeroflot was separated in the '90s and divided into a number of regional airlines, with some former Soviet republics beginning their own services.
The core of the airline then came under control of Russia and remains state-owned.
Aeroflot underwent a massive transformation during the first decade of the 21st century in terms of both service and fleet.
Bar its hammer and sickle logo, the Aeroflot of today bears little resemblance to its original conception.
5. Czech Airlines (CSA)
Czech Airlines, the national airline of the Czech Republic.
MICHAL CIZEK/AFP/Getty Images
Year of foundation: 1923
First flight: October 1923
Passengers transported in 2022: No data
Started as a national airline for the then newly founded country of Czechoslovakia, Czech Airlines' activity was interrupted by World War II and the airline was later reinstated by the post-war Communist government.
In 1957, CSA became the third airline, after BOAC and Aeroflot, to operate jet airliners when it put the Soviet-made Tupolev Tu104A into service.
The airline was also the first to operate a jet-only connection: Prague to Moscow.
During the Cold War years, CSA operated a remarkably large operation that included a fleet of up to 21 long range Ilyushin Il-62 aircraft as well as an extensive route network covering the Americas, Africa, the Middle East and Asia.
Unfortunately it also suffered two unfortunate firsts, becoming the first airline to suffer a mass hijacking, when three of its aircraft were diverted to West Germany by defectors in 1950.
It was also the first airline to lose a captain at the hands of a hijacker, in an incident during the 1970s.
Like many national airlines of the former Eastern Bloc, CSA was renamed, restructured and modernized during the '90s.
The airline has scraped through to its 100th anniversary after being declared bankrupt in 2021, having been hit hard by the Covid-19 pandemic. It's now gone through a reorganization process with a new investor, Prague City Air.
6. Finnair
Finnair's 100th anniversary is November 1, 2023.
Courtesy Finnair
Year of foundation: 1923
First flight: March 1924
Passengers transported in 2022: 9.1 million
For those who've ever wondered why Finnair's airline code is "AY", this is derived from the name it used before being rebranded to Finnair in 1953 -- "Aero O/Y."
During its first 12 years, the airline operated only seaplanes, a logical choice given the many lakes and water inlets that cover the surface of Finland.
In 1983, it became the first European airline to fly non-stop to Tokyo, with DC-10 aircraft.
Five years later, Finnair was the only European airline with a direct flight between Europe and China.
This helped to position the airline as the shortest gateway between Europe and Asia, largely thanks to Helsinki's location atop the Great Circle route.
7. Delta Air Lines
Delta is the oldest airline still operating in the US.
DANIEL SLIM/AFP/AFP/Getty Images
Year of foundation: 1924
Passengers transported in 2022: 141.6 million
Delta has grown from a small crop-dusting operation in America's Deep South to the largest airline in the world by some measures.
Two important corporate decisions helped consolidate it at the top of the global airline leagues -- the purchase of Pan Am's East Coast and European routes in the early '90s and its merger with Northwest Airlines in 2008.
Delta is one of the world's largest airlines in terms of scheduled passengers.
8. Air Serbia
Air Serbia serves more than 70 destinations across Europe, the Mediterranean and Middle East.
ANDREJ ISAKOVIC/AFP/Getty Images
Year of foundation: 1927
Passengers transported in 2022: 2.7 million
Air Serbia claims descent from the several airlines that operated as flag carriers of Yugoslavia (hence its code JU), starting with Aeroput in 1927 and Jat Airways from 1948.
During the Cold War years, Jat developed a significant route network and bought equipment from both East and West, in line with Yugoslavia's status as a non-aligned country.
After the breakup of Yugoslavia, Jat became the Serbian flag carrier.
In 2013, Etihad bought a 49% equity stake in the company, which then engaged in a massive recapitalization and rebranding operation that saw it adopt the new name of Air Serbia.
9. Iberia
In July 2023, Iberia joined British Airways and Qatar Airways' joint business partnership.
Jasper Juinen/Getty Images
Year of foundation: 1927
First flight: December 1927
Passengers transported in 2022: No data
Formerly a privately owned company, Iberia was put under government sponsorship shortly after its launch, providing postal transport between Madrid and Barcelona.
After an operational hiatus in the early 1930s, it was resurrected with German assistance, by the nationalist side during the Spanish Civil War.
After the war, Iberia, now firmly in government hands, developed as Spain's flag carrier.
In 1946, it was the first airline to fly between Europe and South America, a region that has remained at the core of Iberia's long haul business throughout its history.
The airline was privatized in 2001 and it merged with British Airways in 2010 to create the International Airlines Group.
10. British Airways
British Airways is the UK flag carrier.
Dan Kitwood/Getty Images
Year of foundation: 1919 (or 1974)
First flight: August 1919 (or 1974)
Passengers transported in 2018: 44.1 million
Now this one is a little controversial.
The UK flag carrier British Airways was formed 45 years ago following the merger of four companies: British Overseas Airways Corporation, British European Airways, Cambrian Airways and Northeast Airlines.
However, it celebrated ts centenary in 2019 based on the 100 years of achievement of its predecessor airlines.
It all began, says British Airways, on August 25, 1919, when the world's first scheduled international flight between London and Paris took off with one passenger, plus some Devonshire cream and some grouse.
It was the beginning, not just of British Airways, but of international commercial aviation.
